Merge branch 'mdio-mux-cleanup'

Vladimir Oltean says:

====================
MDIO mux cleanup

This small patch set resolves some technical debt in the MDIO mux driver
which was discovered during the investigation for commit 1f9f2143f24e
("net: mdio-mux: fix C45 access returning -EIO after API change").

The patches have been sitting for 2 months in the NXP SDK kernel and
haven't caused issues.
====================

Link: https://lore.kernel.org/r/20231213152712.320842-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>